Wire feeder sampling circuit and system and welding equipment

Abstract

The utility model relates to the technical field of welding, and discloses a wire feeder sampling circuit and system and welding equipment, and the wire feeder sampling circuit comprises an MCU, a voltage input module, a signal driving module, a signal generating module and a signal processing module; the voltage input module is connected with the first end of the signal generation module; the first end of the signal driving module is connected with the first end of the MCU; the second end of the signal driving module is connected with the second end of the signal generating module; the third end of the signal generation module is connected with the first end of the signal processing module; the second end of the signal processing module is connected with the second end of the MCU; the states of the gun switch and the wire detection button are judged according to different sampling voltages when the gun switch and the wire detection button are in different states; and the values of the first potentiometer and the second potentiometer are calculated through differential voltage division of the second pulse signal and the voltage signal. The problem of application of the sampling circuit of the wire feeder under the condition of single power supply is solved.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a wire feeder sampling circuit, system, and welding equipment. Background Technology

[0002] In the current market situation, for sampling wire feeders, the given signals are mostly processed using analog circuits. These analog circuits require positive and negative power supplies to operate, and then undergo a filtering process to convert the signal into a stable one.

[0003] The existing sampling circuits, due to their reliance on positive and negative power supplies, tend to have a slightly slower response speed when adjusting the given information. Utility Model Content

[0004] The purpose of this application is to provide a wire feeder sampling circuit, system, and welding equipment, which aims to solve the problem of the application of the wire feeder sampling circuit under single power supply conditions.

[0005] To achieve the above objectives, this application proposes a wire feeder sampling circuit, which includes: an MCU, a voltage input module, a signal driving module, a signal generation module, and a signal processing module;

[0006] The voltage input module is connected to the first terminal of the signal generation module; the first terminal of the signal driving module is connected to the first terminal of the MCU; the second terminal of the signal driving module is connected to the second terminal of the signal generation module; the third terminal of the signal generation module is connected to the first terminal of the signal processing module; and the second terminal of the signal processing module is connected to the second terminal of the MCU.

[0007] The voltage input module is used to provide a voltage signal to the signal generation module;

[0008] The signal generation module is used to obtain the first sampled signal based on the series voltage divider of resistors;

[0009] The MCU is used to output a first pulse signal to the signal driving module;

[0010] The signal driving module is used to amplify the first pulse signal and convert it into a second pulse signal;

[0011] The signal generation module is further configured to receive the second pulse signal and generate a second sampling signal according to the conduction sequence of the diodes;

[0012] The MCU is also used to guide the welding machine operation based on the first sampling signal and the second sampling signal.

[0013] In one embodiment, the signal processing module includes: a first voltage divider unit and a second voltage divider unit;

[0014] The first terminal of the first voltage divider unit is connected to the first branch of the second terminal of the signal generation module; the second terminal of the first voltage divider unit is connected to the first branch of the second terminal of the MCU.

[0015] The first end of the second voltage divider unit is connected to the second branch of the second end of the signal generation module; the second end of the second voltage divider unit is connected to the second branch of the second end of the MCU.

[0016] The first voltage divider unit is used to receive the first sampled signal, amplify and divide it to generate a gun switch signal;

[0017] The second voltage divider unit is used to receive the second sampled signal and amplify and divide it to generate a given signal;

[0018] The MCU is also used to receive and send the gun switch signal and the given signal to the welding machine to guide the welding machine operation.

[0019] In one embodiment, the signal generation module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first potentiometer, a second potentiometer, a first diode, a second diode, a gun switch, and a wire detection button;

[0020] The first end of the fourth resistor is connected to the second end of the signal driving module; the second end of the fourth resistor is connected to the first end of the first potentiometer, the second end of the first potentiometer, the first end of the second potentiometer, the second end of the second potentiometer, and the first end of the second voltage divider unit.

[0021] The first end of the first resistor is connected to the anode of the first resistor, the cathode of the second resistor, and the second end of the voltage input module; the second end of the first resistor is connected to the first end of the gun switch and the first end of the wire detection button.

[0022] The first end of the third resistor is connected to the first external power supply; the second end of the third resistor is connected to the second end of the gun switch, the first end of the first voltage divider unit, and the second end of the second resistor.

[0023] The first end of the second resistor is connected to the second end of the wire detection button;

[0024] The cathode of the first diode is connected to the third terminal of the first potentiometer;

[0025] The anode of the second diode is connected to the third terminal of the second potentiometer.

[0026] In one embodiment, the first voltage divider unit includes: a second transient current suppressor, a third operational amplifier, a fifth capacitor, a sixth capacitor, a sixteenth resistor, and a seventeenth resistor;

[0027] The first terminal of the third operational amplifier is connected to the first terminal of the sixteenth resistor and the second terminal of the third operational amplifier; the third terminal of the third operational amplifier is connected to the first branch of the second terminal of the signal generation module; the infinite terminal of the third operational amplifier is connected to the first external power supply and the first terminal of the fifth capacitor; the fourth terminal of the third operational amplifier is grounded.

[0028] The second terminal of the fifth capacitor is grounded;

[0029] The second end of the sixteenth resistor is connected to the first end of the seventeenth resistor, the first end of the sixth capacitor, the first end of the second transient current suppressor, and the first branch of the second end of the MCU;

[0030] The second terminal of the seventeenth resistor is grounded;

[0031] The second terminal of the sixth capacitor is connected to the second terminal of the seventeenth resistor;

[0032] The second terminal of the second transient current suppressor is grounded.

[0033] In one embodiment, the second voltage divider unit includes: a first transient current suppressor, a second operational amplifier, a fourth capacitor, a tenth resistor, and a thirteenth resistor;

[0034] The seventh terminal of the second operational amplifier is connected to the first terminal of the tenth resistor and the sixth terminal of the second operational amplifier; the fifth terminal of the second operational amplifier is connected to the second branch of the second terminal of the signal generation module.

[0035] The second end of the tenth resistor is connected to the first end of the thirteenth resistor, the first end of the fourth capacitor, the first end of the first transient current suppressor, and the second branch of the second end of the MCU.

[0036] The second terminal of the thirteenth resistor is grounded;

[0037] The second terminal of the fourth capacitor is connected to the second terminal of the thirteenth resistor;

[0038] The second terminal of the first transient current suppressor is grounded.

[0039] In one embodiment, the first terminal of the MCU is connected to the first terminal of the signal driving module;

[0040] The first branch of the second terminal of the MCU is connected to the second terminal of the first voltage divider unit;

[0041] The second branch of the second terminal of the MCU is connected to the second terminal of the second voltage divider unit.

[0042] In one embodiment, the voltage input module includes: a voltage regulator, a first capacitor, a second capacitor, a fifth resistor, an eighth resistor, and a fifteenth resistor;

[0043] The first end of the eighth resistor is connected to the second external power supply; the second end of the eighth resistor is connected to the first end of the voltage regulator, the first end of the fifteenth resistor, the first end of the first capacitor, the first end of the second capacitor, and the first end of the signal generation module.

[0044] The second terminal of the voltage regulator is grounded;

[0045] The second end of the fifteenth resistor is connected to the first end of the fifth resistor and the third end of the voltage regulator;

[0046] The second end of the fifth resistor is connected to the second end of the voltage regulator;

[0047] The second terminal of the first capacitor is grounded;

[0048] The second terminal of the second capacitor is grounded.

[0049] In one embodiment, the signal driving module includes: a first operational amplifier, a third capacitor, a sixth resistor, a seventh resistor, a ninth resistor, an eleventh resistor, a fourteenth resistor, and a transistor;

[0050] The first end of the eleventh resistor is connected to the first end of the MCU and the first end of the fourteenth resistor; the second end of the eleventh resistor is connected to the base of the transistor.

[0051] The second end of the fourteenth resistor is connected to the emitter of the transistor;

[0052] The emitter of the transistor is grounded; the collector of the transistor is connected to the first terminal of the sixth resistor and the second terminal of the first operational amplifier.

[0053] The second end of the sixth resistor is connected to the first external power supply and the first end of the seventh resistor;

[0054] The second terminal of the seventh resistor is connected to the first terminal of the ninth resistor and the third terminal of the first operational amplifier;

[0055] The second terminal of the ninth resistor is grounded;

[0056] The first terminal of the operational amplifier is connected to the first terminal of the signal generation module; the infinite terminal of the first operational amplifier is connected to the external power supply of the first terminal and the first terminal of the third capacitor; the fourth terminal of the first operational amplifier is grounded.

[0057] The second terminal of the third capacitor is grounded.

[0058] In addition, to achieve the above objectives, this application also proposes a wire feeder sampling system, which includes the wire feeder sampling circuit described above.

[0059] In addition, to achieve the above objectives, this application also proposes a welding device, which includes the wire feeder sampling circuit described above.

[0060] This application proposes a wire feeder sampling circuit, comprising: an MCU, a voltage input module, a signal driving module, a signal generation module, and a signal processing module; the voltage input module is connected to a first terminal of the signal generation module; the first terminal of the signal driving module is connected to a first terminal of the MCU; the second terminal of the signal driving module is connected to a second terminal of the signal generation module; the third terminal of the signal generation module is connected to a first terminal of the signal processing module; the second terminal of the signal processing module is connected to a second terminal of the MCU; the voltage input module provides a voltage signal to the signal generation module; the signal generation module obtains a first sampling signal based on a resistor series voltage divider; the MCU outputs a first pulse signal to the signal driving module; the signal driving module amplifies the first pulse signal and converts it into a second pulse signal; the signal generation module receives the second pulse signal and generates a second sampling signal according to the conduction sequence of diodes; the MCU guides welding machine operations based on the first and second sampling signals. This invention uses a fixed voltage signal as the base voltage. The MCU determines the state of the gun switch and wire detection button by sampling different voltages under different conditions. It also calculates the values ​​of the first and second potentiometers by dividing the voltage difference between the second pulse signal and the voltage signal. Using MCU sampling solves the problem of applying the wire feeder sampling circuit under single power supply conditions, resulting in more accurate sampling signals. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the first embodiment of the wire feeder sampling circuit proposed in this application;

[0062] Figure 2 This is a schematic diagram of the second embodiment of the wire feeder sampling circuit proposed in this application;

[0063] Figure 3This is a circuit connection diagram of the second embodiment of the wire feeder sampling circuit proposed in this application;

[0064] Figure 4 This is a first circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application;

[0065] Figure 5 This is a second circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application;

[0066] Figure 6 This is a third circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application;

[0067] Figure 7 This is the overall circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application.

[0068] The reference numerals in the attached diagram are as follows: 100, MCU; 200, Voltage Input Module; 300, Signal Drive Module; 400, Signal Generation Module; 500, Signal Processing Module; 510, First Voltage Divider Unit; 520, Second Voltage Divider Unit; AN1, Gun Switch; AN2, Wire Detection Button; Q1, Transistor; R1~R17, First Resistor to Seventeenth Resistor; C1~C6, First Capacitor to Sixth Capacitor; U2A, First Operational Amplifier; U2B, Second Operational Amplifier; U3A, Third Operational Amplifier; D1~D2, First Diode to Second Diode; RT1~RT2, First Potentiometer to Second Potentiometer; TVS1, First Transient Current Suppressor; TVS2, Second Transient Current Suppressor; U1, Voltage Regulator. Detailed Implementation

[0069] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0070] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0071] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0072] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0073] Reference Figure 1 , Figure 1 This is a schematic diagram of a module of the first embodiment of the wire feeder sampling circuit proposed in this application. Based on Figure 1 The first embodiment of the sampling circuit for the wire feeder of this application is presented.

[0074] In this embodiment, the wire feeder sampling circuit includes: MCU100, voltage input module200, signal driving module300, signal generation module400, and signal processing module500;

[0075] The voltage input module 200 is connected to the first terminal of the signal generation module 400; the first terminal of the signal driving module 300 is connected to the first terminal of the MCU 100; the second terminal of the signal driving module 300 is connected to the second terminal of the signal generation module 400; the third terminal of the signal generation module 400 is connected to the first terminal of the signal processing module 500; and the second terminal of the signal processing module 500 is connected to the second terminal of the MCU 100.

[0076] It should be understood that the voltage input module 200 provides a fixed DC voltage U0 to the signal generation module 400. The signal generation module 400 requires a fixed voltage to operate normally, and the voltage input module 200 ensures this energy source.

[0077] It should be noted that the first terminal of the signal driving module 300 is connected to the first terminal of the MCU 100, which means that the MCU 100 has the function of controlling or transmitting data to the signal driving module 300. The MCU 100 sends a PWM pulse signal to the signal driving module 300.

[0078] It should be understood that the third terminal of the signal generation module 400 is connected to the first terminal of the signal processing module 500, which is the direct path from signal generation to processing. The signal generated by the signal generation module 400 is transmitted to the signal processing module 500 for subsequent processing, such as filtering and modulation.

[0079] It should be noted that the signal processing module 500 relies on the original signal provided by the signal generation module 400, and the output characteristics (such as frequency and phase) of the signal generation module 400 will affect the processing method and final result of the signal processing module 500.

[0080] It should be understood that the second terminal of the signal processing module 500 is connected to the second terminal of the MCU 100. This may be used by the signal processing module 500 to provide feedback on processing results or status information to the MCU 100. The MCU 100 can adjust the entire system based on this feedback information. For example, if the signal processing module 500 detects a signal abnormality, it can feed back the relevant information to the MCU 100, which can then take measures, such as adjusting the parameters of the signal generation module 400 or the signal driving module 300.

[0081] The voltage input module 200 is used to provide a voltage signal to the signal generation module 400.

[0082] It should be understood that the primary task of the voltage input module 200 is to provide a voltage signal to the signal generation module 400. This voltage signal is the fundamental power source for subsequent operations of the entire system, and its stability and accuracy can have a significant impact on the operation of subsequent modules.

[0083] The signal generation module 400 is used to obtain the first sampled signal based on the series voltage divider of resistors.

[0084] It should be noted that in the circuit, the voltage divider principle of series resistors is used to distribute the input voltage according to the ratio of the resistors. By precisely designing the resistance value of the series resistors, the required first sampling signal can be obtained at a specific node. This sampling signal can reflect certain characteristics of the input voltage, such as voltage magnitude or proportional relationship.

[0085] The MCU100 is used to output a first pulse signal to the signal driving module 300.

[0086] It should be understood that the MCU100, as the control core of the system, can output a first pulse signal to the signal drive module 300. The characteristics of this pulse signal (such as frequency, duty cycle, amplitude, etc.) may be generated according to a pre-set program or algorithm, and its purpose is to provide an initial control signal for subsequent signal amplification and conversion.

[0087] The signal driving module 300 is used to amplify the first pulse signal and convert it into a second pulse signal.

[0088] It should be noted that after receiving the first pulse signal output by the MCU100, the signal driving module 300 first amplifies it. This is because the signal output by the MCU100 may not be sufficient in power or amplitude to drive subsequent circuit components or perform specific operations. The amplified signal then undergoes a conversion circuit (which may involve level conversion, waveform shaping, etc.) to convert the first pulse signal into a second pulse signal. This second pulse signal will be transmitted to the signal generation module 400 for further processing.

[0089] The signal generation module 400 is further configured to receive the second pulse signal and generate a second sampling signal according to the conduction sequence of the diodes.

[0090] It should be understood that when a second pulse signal is received from the signal driving module 300, the signal generation module 400 generates a second sampling signal based on the conduction sequence of the diodes. Diodes have unidirectional conductivity, and their conduction sequence may be related to the characteristics of the pulse signal (such as amplitude and frequency). By rationally arranging the diode connection method and circuit structure, and utilizing the conduction characteristics of the diodes under different pulse signal conditions, a second sampling signal with specific meaning can be generated. This signal will be used to guide the welding machine operation.

[0091] The MCU100 is also used to guide the welding machine operation based on the first sampling signal and the second sampling signal.

[0092] It should be noted that the MCU100 guides the welding machine operation based on the first and second sampled signals obtained from the signal generation module 400. It may analyze and process these two sampled signals, such as comparing signal magnitudes and determining signal trends. Then, according to pre-set rules or algorithms, the MCU100 adjusts the welding machine's operating parameters, such as welding current, welding voltage, and welding time, to ensure that the welding machine performs the welding operation as expected. The following explanation is provided:

[0093] U_PWM: First pulse signal;

[0094] PWM: Second pulse signal, high level is U1, low level is U2;

[0095] Ua: First sampled signal;

[0096] Ub: Second sampling signal;

[0097] U0: Voltage signal (fixed voltage), less than U1, greater than U2;

[0098] U_Gun: Gun switch signal;

[0099] U_V_I: Given signal.

[0100] This embodiment proposes a sampling circuit for a wire feeder, comprising: an MCU 100, a voltage input module 200, a signal driving module 300, a signal generation module 400, and a signal processing module 500; the voltage input module 200 is connected to a first terminal of the signal generation module 400; the first terminal of the signal driving module 300 is connected to a first terminal of the MCU 100; the second terminal of the signal driving module 300 is connected to a second terminal of the signal generation module 400; the third terminal of the signal generation module 400 is connected to a first terminal of the signal processing module 500; and the second terminal of the signal processing module 500 is connected to the MCU 100. The second terminal of U100; the voltage input module 200, used to provide a voltage signal to the signal generation module 400; the signal generation module 400, used to obtain a first sampling signal based on resistor series voltage division; the MCU100, used to output a first pulse signal to the signal driving module 300; the signal driving module 300, used to amplify the first pulse signal and convert it into a second pulse signal; the signal generation module 400, also used to receive the second pulse signal and generate a second sampling signal according to the conduction sequence of the diodes; the MCU100, also used to guide the welding machine operation according to the first sampling signal and the second sampling signal. This invention uses a fixed voltage signal as the base voltage. Based on the different sampling voltages of the gun switch AN1 and the wire detection button AN2 in different states, the MCU100 determines the state of the gun switch AN1 and the wire detection button AN2; through voltage division of the difference between the second pulse signal and the voltage signal, the MCU100 calculates the values ​​of the first potentiometer RT1 and the second potentiometer RT2. Using MCU100 sampling solves the problem of the wire feeder sampling circuit under single power supply conditions, making the sampling signal more accurate.

[0101] Reference Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the second embodiment of the wire feeder sampling circuit proposed in this application. Figure 3 This is a circuit connection diagram of a second embodiment of the wire feeder sampling circuit proposed in this application. Based on the first embodiment of the wire feeder sampling circuit described above, a second embodiment of the wire feeder sampling circuit of this application is proposed.

[0102] In this embodiment, the signal processing module 500 includes: a first voltage divider unit 510 and a second voltage divider unit 520; a first end of the first voltage divider unit 510 is connected to a first branch of the second end of the signal generation module 400; a second end of the first voltage divider unit 510 is connected to a first branch of the second end of the MCU 100; a first end of the second voltage divider unit 520 is connected to a second branch of the second end of the signal generation module 400; and a second end of the second voltage divider unit 520 is connected to a second branch of the second end of the MCU 100.

[0103] It should be understood that the first voltage divider unit 510 is used to receive and amplify and divide the first sampled signal to generate a gun switch signal; the second voltage divider unit 520 is used to receive and amplify and divide the second sampled signal to generate a given signal; the MCU 100 is also used to receive and send the gun switch signal and the given signal to the welding machine to guide the welding machine operation.

[0104] The first voltage divider unit 510 includes: a second transient current suppressor TVS2, a third operational amplifier U3A, a fifth capacitor C5, a sixth capacitor C6, a sixteenth resistor R16, and a seventeenth resistor R17.

[0105] It should be understood that the first terminal of the third operational amplifier U3A is connected to the first terminal of the sixteenth resistor R16 and the second terminal of the third operational amplifier U3A; the third terminal of the third operational amplifier U3A is connected to the first branch of the second terminal of the signal generation module 400; the infinite terminal of the third operational amplifier U3A is connected to the first external power supply and the first terminal of the fifth capacitor C5; the fourth terminal of the third operational amplifier U3A is grounded; the second terminal of the fifth capacitor C5 is grounded; the second terminal of the sixteenth resistor R16 is connected to the first terminal of the seventeenth resistor R17, the first terminal of the sixth capacitor C6, the first terminal of the second transient current suppressor TVS2, and the first branch of the second terminal of the MCU100; the second terminal of the seventeenth resistor R17 is grounded; the second terminal of the sixth capacitor C6 is connected to the second terminal of the seventeenth resistor R17; the second terminal of the second transient current suppressor TVS2 is grounded.

[0106] The second voltage divider unit 520 includes: a first transient current suppressor TVS1, a second operational amplifier U2B, a fourth capacitor C4, a tenth resistor R10, and a thirteenth resistor R13.

[0107] It should be noted that the seventh terminal of the second operational amplifier U2B is connected to the first terminal of the tenth resistor R10 and the sixth terminal of the second operational amplifier U2B; the fifth terminal of the second operational amplifier is connected to the second branch of the second terminal of the signal generation module 400; the second terminal of the tenth resistor R10 is connected to the first terminal of the thirteenth resistor R13, the first terminal of the fourth capacitor C4, the first terminal of the first transient current suppressor TVS1, and the second branch of the second terminal of the MCU100; the second terminal of the thirteenth resistor R13 is grounded; the second terminal of the fourth capacitor C4 is connected to the second terminal of the thirteenth resistor R13; and the second terminal of the first transient current suppressor TVS1 is grounded.

[0108] In this embodiment, the first sampled signal is amplified and divided into a gun switch signal, and the second sampled signal is amplified and divided into a given signal. This facilitates the MCU100 in determining the state of the gun switch AN1 and the wire detection button AN2, and in calculating the values ​​of the first potentiometer RT1 and the second potentiometer RT2. Using MCU100 sampling solves the problem of applying the wire feeder sampling circuit under single power supply conditions.

[0109] Reference Figure 4 , Figure 4 This is a first circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application. Based on the first and second embodiments of the wire feeder sampling circuit described above, a third embodiment of the wire feeder sampling circuit of this application is proposed.

[0110] The voltage input module 200 includes: a voltage regulator U1, a first capacitor C1, a second capacitor C2, a fifth resistor R5, an eighth resistor R8, and a fifteenth resistor R15.

[0111] It should be noted that the first end of the eighth resistor R8 is connected to the second external power supply; the second end of the eighth resistor R8 is connected to the first end of the voltage regulator U1, the first end of the fifteenth resistor R15, the first end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the signal generation module 400; the second end of the voltage regulator U1 is grounded; the second end of the fifteenth resistor R15 is connected to the first end of the fifth resistor R5 and the third end of the voltage regulator U1; the second end of the fifth resistor R5 is connected to the second end of the voltage regulator U1; the second end of the first capacitor C1 is grounded; and the second end of the second capacitor C2 is grounded.

[0112] It should be understood that a voltage regulator U0 is formed by the voltage regulator U1 (TL431) and R5 and R15, and U0 = 2.5*(R5+R15) / R5.

[0113] Reference Figure 5 , Figure 5This is a second circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application.

[0114] The signal driving module 300 includes: a first operational amplifier U2A, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, a ninth resistor R9, an eleventh resistor R11, a fourteenth resistor R14, and a transistor Q1.

[0115] It should be understood that the first end of the eleventh resistor R11 is connected to the first end of the MCU100 and the first end of the fourteenth resistor R14; the second end of the eleventh resistor R11 is connected to the base of the transistor Q1; the second end of the fourteenth resistor R14 is connected to the emitter of the transistor Q1; the emitter of the transistor Q1 is grounded; the collector of the transistor Q1 is connected to the first end of the sixth resistor R6 and the second end of the first operational amplifier U2A; the second end of the sixth resistor R6 is connected to the first external power supply and the first end of the seventh resistor R7; the second end of the seventh resistor R7 is connected to the first end of the ninth resistor R9 and the third end of the first operational amplifier U2A; the second end of the ninth resistor R9 is grounded; the first end of the operational amplifier is connected to the first end of the signal generation module 400; the infinite end of the first operational amplifier U2A is connected to the first external power supply and the first end of the third capacitor C3; the fourth end of the first operational amplifier U2A is grounded; the second end of the third capacitor C3 is grounded.

[0116] It should be noted that when the MCU100 outputs the U_PWM pulse signal, Q1 is not turned on when it is low, and the collector of Q1 is at a high level (VCC), which is higher than the voltage at pin 3 of U2A, so pin 1 of U2A outputs a low level. Conversely, when it is high, Q1 is turned on, and the collector of Q1 is at a low level, which is lower than the voltage at pin 3 of U2A, so pin 1 of U2A outputs a high level. Therefore, the pulse signal output at pin 1 of U2A is U1 when it is high and U2 when it is low.

[0117] Reference Figure 6 , Figure 6 This is a third circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application.

[0118] The signal generation module 400 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first potentiometer RT1, a second potentiometer RT2, a first diode D1, a second diode D2, a gun switch AN1, and a wire detection button AN2.

[0119] It should be noted that the first end of the fourth resistor R4 is connected to the second end of the signal driving module 300; the second end of the fourth resistor R4 is connected to the first end of the first potentiometer RT1, the second end of the first potentiometer RT1, the first end of the second potentiometer RT2, the second end of the second potentiometer RT2, and the first end of the second voltage divider unit 520; the first end of the first resistor R1 is connected to the anode of the first resistor R1, the cathode of the second resistor R2, and the second end of the voltage input module 200; the second end of the first resistor R1 is connected to the first end of the gun switch AN1 and the first end of the wire detection button AN2; the first end of the third resistor R3 is connected to the first external power supply; the second end of the third resistor R3 is connected to the second end of the gun switch AN1, the first end of the first voltage divider unit 510, and the second end of the second resistor R2; the first end of the second resistor R2 is connected to the second end of the wire detection button AN2; the cathode of the first diode D1 is connected to the third end of the first potentiometer RT1; and the anode of the second diode D2 is connected to the third end of the second potentiometer RT2.

[0120] It should be understood that when AN1 and AN2 are not conducting, Ua = VCC;

[0121] When AN1 is on, Ua = (U0*R3 + VCC*R1) / (R1 + R3);

[0122] When AN2 is on and AN1 is off, Ua = {U0*R3+VCC*(R1+R2)} / (R1+R2+R3);

[0123] The final signal Ua is isolated and divided again before entering the MCU100. After calculation, the states of AN1 and AN2 are determined.

[0124] It should be noted that when the PWM is high (U1), U1 flows to U0 through R4, RT2, and D2. According to the circuit diagram: Ub = {U1*RT2 + (U0 + Ud)*R4} / (R4 + RT2)

[0125] When the PWM is low (U2), U0 flows to U2 through D1, RT1, and R4. According to the circuit diagram, Ub = {U2*RT1 + (U0 - Ud)*R4} / (R4 + RT1), where the forward voltage drop of the diode is Ud = 0.7V.

[0126] The final signal Ub is divided again and then enters the MCU100. The magnitudes of RT1 and RT2 are calculated, and then the corresponding given signal is output to the welding machine.

[0127] Reference Figure 7 , Figure 7This is the overall circuit connection diagram of the third embodiment of the wire feeder sampling circuit proposed in this application.

[0128] In this embodiment, a fixed voltage signal U0 is used as the base voltage. Based on the different sampled voltages of the gun switch AN1 and the wire detection button AN2 in different states, the MCU100 determines the states of the gun switch AN1 and the wire detection button AN2. By dividing the voltage difference between the second pulse signal and the voltage signal, the MCU100 calculates the values ​​of the first potentiometer RT1 and the second potentiometer RT2. Using MCU100 sampling solves the problem of applying the wire feeder sampling circuit under single power supply conditions, resulting in more accurate sampling signals.

[0129] Furthermore, to achieve the above objectives, this application also proposes a wire feeder sampling system, which includes the wire feeder sampling circuit described above. Since the wire feeder sampling system employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0130] Furthermore, to achieve the above objectives, this application also proposes a welding device, which includes the wire feeder sampling circuit described above. Since the welding device employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0131] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0132] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A wire feeder sampling circuit, comprising: The wire feeder sampling circuit comprises an MCU, a voltage input module, a signal driving module, a signal generating module and a signal processing module. The voltage input module is connected to the first end of the signal generating module; the first end of the signal driving module is connected to the first end of the MCU; the second end of the signal driving module is connected to the second end of the signal generating module; the third end of the signal generating module is connected to the first end of the signal processing module; the second end of the signal processing module is connected to the second end of the MCU. The voltage input module is configured to provide a voltage signal to the signal generating module. The signal generating module is configured to obtain a first sampling signal based on resistance series voltage division. The MCU is configured to output a first pulse signal to the signal driving module. The signal driving module is configured to amplify the first pulse signal and convert it into a second pulse signal. The signal generating module is further configured to receive the second pulse signal and generate a second sampling signal according to the conduction sequence of diodes. The MCU is further configured to guide welding machine operation according to the first sampling signal and the second sampling signal.

2. The wire feeder sampling circuit of claim 1, wherein, The signal processing module comprises a first voltage dividing unit and a second voltage dividing unit. The first end of the first voltage dividing unit is connected to the first branch of the second end of the signal generating module; the second end of the first voltage dividing unit is connected to the first branch of the second end of the MCU. The first end of the second voltage dividing unit is connected to the second branch of the second end of the signal generating module; the second end of the second voltage dividing unit is connected to the second branch of the second end of the MCU. The first voltage dividing unit is configured to receive and amplify and divide the first sampling signal to generate a gun switch signal. The second voltage dividing unit is configured to receive and amplify and divide the second sampling signal to generate a given signal. The MCU is further configured to receive and send the gun switch signal and the given signal to the welding machine to guide welding machine operation.

3. The wire feeder sampling circuit of claim 2, wherein, The signal generating module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first potentiometer, a second potentiometer, a first diode, a second diode, a gun switch and a wire detection button. The first end of the fourth resistor is connected to the second end of the signal driving module; the second end of the fourth resistor is connected to the first end of the first potentiometer, the second end of the first potentiometer, the first end of the second potentiometer, the second end of the second potentiometer and the first end of the second voltage dividing unit. The first end of the first resistor is connected to the anode of the first resistor, the cathode of the second resistor and the second end of the voltage input module; the second end of the first resistor is connected to the first end of the gun switch and the first end of the wire detection button. The first end of the third resistor is connected to a first external power supply; the second end of the third resistor is connected to the second end of the gun switch, the first end of the first voltage dividing unit and the second end of the second resistor. The first end of the second resistor is connected to the second end of the wire detection button. The cathode of the first diode is connected to the third end of the first potentiometer. The anode of the second diode is connected to the third end of the second potentiometer.

4. The wire feeder sampling circuit of claim 2, wherein, The first voltage division unit comprises a second transient current suppressor, a third operational amplifier, a fifth capacitor, a sixth capacitor, a sixteenth resistor and a seventeenth resistor; The first end of the third operational amplifier is connected with the first end of the sixteenth resistor and the second end of the third operational amplifier; the third end of the third operational amplifier is connected with the first branch of the second end of the signal generation module; the infinite end of the third operational amplifier is connected with a first external power supply and the first end of the fifth capacitor; the fourth end of the third operational amplifier is grounded; The second end of the fifth capacitor is grounded; The second end of the sixteenth resistor is connected with the first end of the seventeenth resistor, the first end of the sixth capacitor, the first end of the second transient current suppressor and the first branch of the second end of the MCU; The second end of the seventeenth resistor is grounded; The second end of the sixth capacitor is connected with the second end of the seventeenth resistor; The second end of the second transient current suppressor is grounded.

5. The wire feeder sampling circuit of claim 2, wherein, The second voltage division unit comprises a first transient current suppressor, a second operational amplifier, a fourth capacitor, a tenth resistor and a thirteenth resistor; The seventh end of the second operational amplifier is connected with the first end of the tenth resistor and the sixth end of the second operational amplifier; the fifth end of the second operational amplifier is connected with the second branch of the second end of the signal generation module; The second end of the tenth resistor is connected with the first end of the thirteenth resistor, the first end of the fourth capacitor, the first end of the first transient current suppressor and the second branch of the second end of the MCU; The second end of the thirteenth resistor is grounded; The second end of the fourth capacitor is connected with the second end of the thirteenth resistor; The second end of the first transient current suppressor is grounded.

6. The wire feeder sampling circuit of claim 2, wherein: The first end of the MCU is connected with the first end of the signal driving module; The first branch of the second end of the MCU is connected with the second end of the first voltage division unit; The second branch of the second end of the MCU is connected with the second end of the second voltage division unit.

7. The wire feeder sampling circuit of claim 1, wherein, The voltage input module comprises a voltage stabilizer, a first capacitor, a second capacitor, a fifth resistor, an eighth resistor and a fifteenth resistor; The first end of the eighth resistor is connected with a second external power supply; the second end of the eighth resistor is connected with the first end of the voltage stabilizer, the first end of the fifteenth resistor, the first end of the first capacitor, the first end of the second capacitor and the first end of the signal generation module; The second end of the voltage stabilizer is grounded; The second end of the fifteenth resistor is connected with the first end of the fifth resistor and the third end of the voltage stabilizer; The second end of the fifth resistor is connected with the second end of the voltage stabilizer; The second end of the first capacitor is grounded; The second end of the second capacitor is grounded.

8. The wire feeder sampling circuit of claim 1, wherein, The signal driving module comprises a first operational amplifier, a third capacitor, a sixth resistor, a seventh resistor, a ninth resistor, an eleventh resistor, a fourteenth resistor and a triode; The first end of the eleventh resistor is connected with the first end of the MCU and the first end of the fourteenth resistor; the second end of the eleventh resistor is connected with the base of the triode; The second end of the fourteenth resistor is connected to the emitter of the transistor; The emitter of the transistor is connected to ground; the collector of the transistor is connected to the first end of the sixth resistor and the second end of the first operational amplifier; The second end of the sixth resistor is connected to a first external power source and the first end of the seventh resistor; The second end of the seventh resistor is connected to the first end of the ninth resistor and the third end of the first operational amplifier; The second end of the ninth resistor is connected to ground; The first end of the operational amplifier is connected to the first end of the signal generation module; the infinite end of the first operational amplifier is connected to the first external power source and the first end of the third capacitor; the fourth end of the first operational amplifier is connected to ground; The second end of the third capacitor is connected to ground.

9. A wire feeder sampling system characterized by, The wire feeder sampling system comprises the wire feeder sampling circuit according to any one of claims 1 to 8.

10. A welding apparatus characterized by comprising: The welding apparatus comprises the wire feeder sampling circuit according to any one of claims 1 to 8.

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